CN108709295A - A kind of variable-frequency multi-connection type air-conditioning system protection control method - Google Patents
A kind of variable-frequency multi-connection type air-conditioning system protection control method Download PDFInfo
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- CN108709295A CN108709295A CN201810524082.8A CN201810524082A CN108709295A CN 108709295 A CN108709295 A CN 108709295A CN 201810524082 A CN201810524082 A CN 201810524082A CN 108709295 A CN108709295 A CN 108709295A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention discloses a kind of variable-frequency multi-connection type air-conditioning system protection control method, including step S1, and exhaust sensor, inner disc sensor and the frequency detecting control module of variable-frequency multi-connection type air-conditioning system collect real time data when operation of air conditioner；S2, main control unit control the variable-frequency multi-connection type air-conditioning system according to the real time data and enter normal control mode, limitation control model, protection control model or pressure control model；The exhaust sensor is arranged at the vent position of compressor；The inner disc sensor is arranged on the evaporator；The present invention can be modified according to load variations situation in the different system protection adjustment interval range of division, ensure unit reliability simultaneously, variable-frequency multi-connection type air-conditioning system refrigeration effect best in any environment, to improve the comfort that user uses.
Description
Technical field
The present invention relates to airconditioning control fields, and in particular to a kind of variable-frequency multi-connection type air-conditioning system protection control method.
Background technology
Variable-frequency multi-connection type air-conditioning is a kind of more, Intelligent Fuzzy Control, conditional parameter complexity the refrigeration system of system construction, because
With managing, simple, energy-efficient, installation maintenance is at low cost, uses the advantages such as simple and convenient, as technology is constantly updated, frequency conversion
Multi-connected air conditioner is the important trend in future.
Current multi-connected air conditioning system protection, the running frequency range of compressor is controlled according to delivery temperature, pressure, because
When operation load and use environment abrupt, corresponding regulative mode can be taken to ensure the reliable of multi-connected air conditioning system
Property, but the using effect and comfort of user can be reduced simultaneously.
Invention content
In view of this, the present invention is directed to propose a kind of variable-frequency multi-connection type air-conditioning system protection control method, existing to solve
Variable-frequency multi-connection type air-conditioning system can not ensure the comfortableness problem that the reliability of system operation and user use simultaneously.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of variable-frequency multi-connection type air-conditioning system protection control method, including step：
S1, exhaust sensor, inner disc sensor and the frequency detecting control module of variable-frequency multi-connection type air-conditioning system collect sky
Allocate and transport real time data when row；
S2, main control unit control the variable-frequency multi-connection type air-conditioning system according to the real time data and enter normal control mould
Formula, limitation control model, protection control model force control model；
The exhaust sensor is arranged at the vent position of compressor；The inner disc sensor is arranged in the evaporation
On device；
The inner disc sensor obtains real-time evaporating temperature, and the frequency detecting control module obtains the real-time frequency of compressor
Rate, the exhaust sensor obtain real-time ventilation information；The main control unit is real to the real-time evaporating temperature, the compressor
When frequency and real-time ventilation information analysis processing, and corresponding output frequency adjustment signal and aperture adjust signal, the frequency
Rate detects control module and corresponds to the adjustment compressor frequency according to the frequency adjusted signal, and expansion valve detects control module root
It is corresponded to according to aperture adjustment signal and adjusts the expansion valve opening.
Preferably, main control unit setting first exhaust threshold value, second exhaust threshold value, third are vented threshold value, described the
One exhaust threshold value is less than the second exhaust threshold value, and the second exhaust threshold value is less than the third and is vented threshold value；By described
First exhaust threshold value, the second exhaust threshold value, the third are vented threshold value to delimit different adjustment interval ranges, to judge
Variable-frequency multi-connection type air-conditioning system is stated to enter normal control mode, limitation control model, protection control model or force control model.
Preferably, when the exhaust sensor is set as temperature sensor, the exhaust sensor obtains real-time ventilation temperature
Spend Td；The first exhaust threshold value Td1, the second exhaust threshold value Td2, third exhaust threshold value Td3 are set as temperature value.
Preferably, when the real time exhaust gas temperature meets the condition of Td≤Td1, the variable-frequency multi-connection type air-conditioning system enters
The normal control mode, under the normal control mode, the variable-frequency multi-connection type air-conditioning system is become according to ambient temperature
Frequency normal operation.
Preferably, when the real time exhaust gas temperature meets the condition of Td1 < Td≤Td2, variable-frequency multi-connection type air-conditioning system
System enters the limitation control model；In the limitation control model, stand-by period, within the stand-by period, the room are set
Interior expansion valve keeps current aperture state, the compressor to keep current operation frequency；
When the compressor real-time frequency is less than maximum target frequency, the exhaust sensor is after the stand-by period
Detect that the real time exhaust gas temperature is maintained within the scope of Td1 < Td≤Td2, then the main control unit output frequency adjustment letter
Number and aperture adjust signal, expansion valve detection control module is controlled the indoor expansion valve aperture and is gradually increased with first rate
Add, while the frequency detecting control module controls the compressor frequency and rises, until the compressor real-time frequency reaches
Maximum value；
Preferably, when the compressor real-time frequency reaches maximum target frequency, and the institute of inner disc sensor detection
When stating real-time evaporating temperature and being not up to optimum target evaporating temperature, the exhaust sensor detects institute after the stand-by period
It states real time exhaust gas temperature to be maintained within the scope of Td1 < Td≤Td2, then the main control unit output aperture adjusts signal, described
Expansion valve detection control module controls the indoor expansion valve and automatically adjusts until the real-time evaporating temperature reaches described
Optimum target evaporating temperature.
Preferably, when the real time exhaust gas temperature meets the condition of Td2 < Td≤Td3, variable-frequency multi-connection type air-conditioning system
System enters the protection control model；Under the protection control model state, the main control unit is forbidden promoting compressor frequency
Rate, the indoor expansion valve aperture are opened greatly with the second rate, until the real time exhaust gas temperature Td is reduced to the second exhaust
Threshold value Td2 or less；During the big indoor expansion valve aperture being opened with second rate, the delivery temperature fall
Less than 1 DEG C, then the indoor expansion valve aperture is with third speed positive opening, until the real time exhaust gas temperature Td is reduced to institute
State first exhaust threshold value Td2 or less.
Preferably, when the real time exhaust gas temperature meets the condition of Td > Td3, the variable-frequency multi-connection type air-conditioning system enters
The pressure control model；Under the pressure control model, the main control unit is forced to reduce the compressor frequency, simultaneously
The indoor expansion valve aperture is opened greatly with fourth rate, until the real time exhaust gas temperature Td is reduced to the second exhaust threshold
Value Td2 or less；During opening the big indoor expansion valve aperture with the fourth rate, the delivery temperature fall
Less than 1 DEG C, then the indoor expansion valve aperture is opened greatly with the 5th rate, until the real time exhaust gas temperature Td is reduced to described the
Two exhaust threshold value Td2 or less.
Preferably, the first exhaust threshold value Td1 is set as 95 DEG C, the second exhaust threshold value Td2 is set as 98 DEG C, institute
It states third exhaust threshold value Td3 and is set as 102 DEG C.
Preferably, when the exhaust sensor is set as pressure sensor, the exhaust sensor obtains real-time ventilation pressure
Power Pd；The first exhaust threshold value Pd1, the second exhaust threshold value Pd2, third exhaust threshold value Pd3 are set as pressure value,
The first exhaust threshold value Pd2 is set as 3.76MPa, and the second exhaust threshold value Pd2 is set as 3.9MPa, the third exhaust
Threshold value Pd3 is set as 4.05MPa.
Compared with the existing technology, the structure of temperature probe holder of the present invention has the advantage that：
Each detection part of the variable-frequency multi-connection type air-conditioning system is real by compressor frequency value, expansion valve opening value, air-conditioning
When evaporating temperature value, outlet air temperature or exhaust pressure value feed back to the main control unit, the main control unit is to the data
Analyzing processing is carried out, the frequency detecting control module, expansion valve detection control module adjustment compressor frequency are then controlled
Rate, expansion valve opening so that in the different system protection adjustment interval range of division, can be repaiied according to load variations situation
Just, ensureing unit reliability simultaneously, variable-frequency multi-connection type air-conditioning system refrigeration effect best in any environment, to put forward
The comfort that high user uses.
Description of the drawings
Fig. 1 is the structure chart of the variable-frequency multi-connection type air-conditioning system；
Fig. 2 is the flow chart that the variable-frequency multi-connection type air-conditioning system protects control method embodiment three；
Fig. 3 is the flow chart that the variable-frequency multi-connection type air-conditioning system protects control method example IV.
Digital representation in figure：
1- compressors；2- exhaust sensors；3- high-voltage switch gears；4- oil eliminators；5- high pressure sensors；6- four-ways commutate
Valve；7- condensers；8- circumstance temperature sensors；9- external disk sensors；10- filters；11- outdoor expansion valves；12- high-pressure stop valves；
13- low-pressure shutoff valves；14- low tension switches；15- air suction sensors；16- indoor expansion valves；17- feed liquor sensors；18- inner discs pass
Sensor；19- goes out gas sensor；20- evaporators；Ring sensor in 21-.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In addition, the directionality instruction being previously mentioned in an embodiment of the present invention, then directionality instruction is only used for explaining
Relative position relation, motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if the particular pose
When changing, then directionality instruction also correspondingly changes correspondingly.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment one
As shown in Figure 1, the variable-frequency multi-connection type air-conditioning system of the present invention includes outdoor unit and several indoor units, the indoor unit
It is connected by connection pipe for internal-external unit with the outdoor unit.The outdoor unit include compressor 1, exhaust sensor 2, high-voltage switch gear 3,
Oil eliminator 4, high pressure sensor 5, four-way reversing valve 6, condenser 7, circumstance temperature sensor 8, external disk sensor 9, filter 10, room
Outer expansion valve 11, high-pressure stop valve 12, low-pressure shutoff valve 13, low tension switch 14, air suction sensor 15.The exhaust sensor 2
It is separately positioned at the exhaust outlet and air inlet position of the compressor 1 with the air suction sensor 15, the exhaust sensor 2
Temperature sensor or pressure sensor are may be configured as, detects temperature or pressure at the exhaust outlet of compressor respectively.The machine
Including indoor expansion valve 16, feed liquor sensor 17, inner disc sensor 18, go out gas sensor 19, evaporator 20, interior ring sensor
21.The inner disc sensor 18 is arranged on the evaporator 20, for detecting the real-time evaporating temperature of air-conditioning.
The variable-frequency multi-connection type air-conditioning system is additionally provided with frequency detecting control module, expansion valve detection control module, master
Control unit, wherein
The frequency detecting control module is used to detect the running frequency of the compressor 1, and the frequency values that will be detected
The main control unit is fed back to, and for receiving the frequency adjusted signal for coming from the main control unit, is corresponded to described in adjustment
Compressor frequency；
Expansion valve detection control module is used to detect the current aperture of the indoor expansion valve 16, and will detect
Opening value feeds back to the main control unit, and for receiving the aperture adjustment signal for coming from the main control unit, corresponding to adjust
The aperture of the whole indoor expansion valve 16, by detecting the current aperture of the indoor expansion valve 16 in real time to control the room
The aperture regulation rate of interior expansion valve 16；
In the present embodiment, each detection part of the variable-frequency multi-connection type air-conditioning system opens compressor frequency value, expansion valve
The real-time evaporating temperature value of angle value, air-conditioning, outlet air temperature or exhaust pressure value feed back to the main control unit, the main control unit
Analyzing processing is carried out to the data, then controls the frequency detecting control module, expansion valve detection control module tune
Whole compressor frequency, expansion valve opening so that, can be according to load variations feelings in the different system protection adjustment interval range of division
Condition is modified, and is ensureing unit reliability simultaneously, variable-frequency multi-connection type air-conditioning system refrigeration best in any environment
Effect, to improve the comfort that user uses..
Embodiment two
Variable-frequency multi-connection type air-conditioning system protection control method provided in this embodiment includes the following steps：
When S1, the exhaust sensor 2, the inner disc sensor 18 and frequency detecting control module collect operation of air conditioner
Real time data；
Specifically, the inner disc sensor 18 obtains real-time evaporating temperature, the frequency detecting control module obtains compression
Machine real-time frequency.When the exhaust sensor 2 is set as temperature sensor, the exhaust sensor 2 obtains real-time ventilation temperature
Degree, when the exhaust sensor 2 is set as pressure sensor, the exhaust sensor 2 obtains real-time ventilation pressure.
S2, the main control unit control the variable-frequency multi-connection type air-conditioning system according to the real time data and enter normal control
Pattern, limitation control model, protection control model force control model.
Specifically, the main control unit handles the real-time data analysis, and corresponding output frequency adjusts signal and opens
Degree adjustment signal, the frequency detecting control module correspond to according to the frequency adjusted signal and adjust the compressor frequency, institute
It states expansion valve detection control module and the signal correspondence adjustment expansion valve opening is adjusted according to the aperture, until the reality of air conditioner
When delivery temperature or real-time ventilation pressure reach in zone of reasonableness.
The main control unit sets first exhaust threshold value, second exhaust threshold value, and third is vented threshold value, the first exhaust threshold
Value is less than the second exhaust threshold value, and the second exhaust threshold value is less than the third and is vented threshold value；Pass through the first exhaust
Threshold value, the second exhaust threshold value, the third are vented threshold value, delimit different system protection adjustment interval ranges, and each
Section can be modified according to load variations situation, while ensureing the variable-frequency multi-connection type air-conditioning system reliability service,
16 aperture of the indoor expansion valve is adjusted in the comparison in different sections according to the real time exhaust gas temperature, controls the compressor
Running frequency avoids the real time exhaust gas temperature from being in the condition of high temperature, it is ensured that the variable-frequency multi-connection type air-conditioning system is in any ring
Best refrigeration effect under border, to improve the comfort that user uses.
Embodiment three
As shown in Fig. 2, Fig. 2 is the flow chart that the present embodiment variable-frequency multi-connection type air-conditioning system protects control method；In this reality
It applies in example, the exhaust sensor 2 is set as temperature sensor, the first exhaust threshold value, the second exhaust threshold value, described
Third exhaust threshold value is set as temperature value, and the first exhaust threshold value is Td1, and the second exhaust threshold value is Td2, the third
Exhaust threshold value is Td3.In general, the first exhaust threshold value Td1 is set as 95 DEG C, the second exhaust threshold value Td2 is set as
98 DEG C, the third exhaust threshold value Td3 is set as 102 DEG C.
When the real time exhaust gas temperature meets the condition of Td≤Td1, the variable-frequency multi-connection type air-conditioning system enter it is described just
Normal control model is simultaneously run, and under the normal control mode, the variable-frequency multi-connection type air-conditioning system is become according to ambient temperature
Frequency normal operation.
When the real time exhaust gas temperature meets the condition of Td1 < Td≤Td2, the variable-frequency multi-connection type air-conditioning system enters institute
It states limitation control model and runs.
When the real time exhaust gas temperature just reaches the condition of sufficient Td1 < Td≤Td2, i.e., the described variable-frequency multi-connection type air-conditioning system is rigid
When into the limitation control model, be set, within the stand-by period, 16 aperture of the indoor expansion valve is kept the stand-by period
Current aperture state, the compressor 1 keep current operation frequency.The stand-by period is traditionally arranged to be 20 minutes.
When the compressor real-time frequency is less than maximum target frequency, the maximum target frequency is traditionally arranged to be described
The specified maximum frequency of compressor 1；The exhaust sensor 2 detects the real time exhaust gas temperature still after the stand-by period
It is maintained within the scope of Td1 < Td≤Td2, then the main control unit output frequency adjustment signal and aperture adjust signal, described
Expansion valve detection control module is controlled 16 aperture of indoor expansion valve and is gradually increased with first rate, while the frequency detecting
Control module controls the compressor frequency and slowly rises, until the compressor real-time frequency reaches maximum value；Preferably, institute
It states the first rate of 16 aperture of indoor expansion valve to walk for every 10 minutes 2-5, the compressor frequency is with every 10 minutes 1HZ's
Rate gradually increases.
Under the limitation control model, when the compressor real-time frequency has reached the maximum target frequency, and it is described
When the real-time evaporating temperature that inner disc sensor 18 detects is not up to optimum target evaporating temperature, the exhaust sensor 2 exists
Detect that the real time exhaust gas temperature remains within the scope of Td1 < Td≤Td2 after the stand-by period, then the master control list
Member output aperture adjusts signal, and the expansion valve detection control module controls the indoor expansion valve 16 and slowly automatically adjusted
Until the real-time evaporating temperature reaches the optimum target evaporating temperature.In general, 16 aperture of the indoor expansion valve is with every
The rate of 10 minutes 2-5 steps gradually changes adjusting, and the optimum target evaporating temperature is set as 7 DEG C.
Under the control of the limitation control model, the real time exhaust gas temperature Td is reduced to the first exhaust threshold value
Td1 and it is following when, the variable-frequency multi-connection type air-conditioning system is restored to the normal control mode.
When the real time exhaust gas temperature meets the condition of Td2 < Td≤Td3, the variable-frequency multi-connection type air-conditioning system enters institute
It states protection control model and runs.Specifically, under the protection control model state, the main control unit is forbidden described in promotion
Compressor frequency, 16 aperture of the indoor expansion valve are opened greatly with the second rate enforcement, until the real time exhaust gas temperature Td is reduced
To the second exhaust threshold value Td2 or less.If opening the indoor expansion valve 16 with second rate and when being kept for one section
Between after, the delivery temperature fall be less than 1 DEG C, then 16 aperture of the indoor expansion valve is with third speed positive opening, directly
It is reduced to the first exhaust threshold value Td2 or less to the real time exhaust gas temperature Td.The interior is opened with second rate
The duration of expansion valve 16 is traditionally arranged to be 10 minutes.
In general, second rate is more than the first rate, the third speed is more than second rate；Preferably
, second rate is set as every three minutes 10 steps, and the third speed is set as every three minutes 20 steps.
When the real time exhaust gas temperature meets the condition of Td > Td3, the variable-frequency multi-connection type air-conditioning system enters described strong
Control model processed is simultaneously run.
Under the pressure control model, the main control unit forces to reduce the compressor frequency, while by the room
16 aperture of interior expansion valve is opened greatly with fourth rate pressure, until the real time exhaust gas temperature Td is reduced to the second exhaust threshold value
Td2 or less.If opening the indoor expansion valve 16 with the fourth rate and after being kept for a period of time, under the delivery temperature
Range of decrease degree is less than 1 DEG C, then 16 aperture of the indoor expansion valve is opened greatly with the 5th rate enforcement, until the real time exhaust gas temperature Td
It is reduced to the second exhaust threshold value Td2 or less.The duration one of the indoor expansion valve 16 is opened with the fourth rate
As be set as 5 minutes.
In general, the fourth rate is more than the third speed, the 5th rate is more than the fourth rate；Preferably
, the fourth rate is set as 60 step per minute, and the 5th rate is set as 100 step per minute.
When the real time exhaust gas temperature Td is reduced to the second exhaust threshold value Td2 or less, the variable-frequency multi-connection type is empty
Adjusting system enters the limitation control model and runs, and under the control of the main control unit, in the limitation control model
Under further decrease the real time exhaust gas temperature Td, make the variable-frequency multi-connection type air-conditioning system enter the normal control mould
Formula.
The present embodiment delimit different system protection adjustment interval ranges, and each area according to the real time exhaust gas temperature
Between can be modified according to load variations situation, while ensureing the variable-frequency multi-connection type air-conditioning system reliability service, root
16 aperture of the indoor expansion valve is adjusted in the comparison in different sections according to the real time exhaust gas temperature, controls the compressor fortune
Line frequency avoids the real time exhaust gas temperature from being in the condition of high temperature, it is ensured that the variable-frequency multi-connection type air-conditioning system is in any environment
Best refrigeration effect down, to improve the comfort that user uses.
Example IV
As shown in figure 3, Fig. 3 is the flow chart that the present embodiment variable-frequency multi-connection type air-conditioning system protects control method；In this reality
It applies in example, the exhaust sensor 2 is set as pressure sensor, the first exhaust threshold value, the second exhaust threshold value, described
Third exhaust threshold value is set as pressure value, and the first exhaust threshold value is Pd1, and the second exhaust threshold value is Pd2, the third
Exhaust threshold value is Pd3.In general, the first exhaust threshold value Pd1 is set as 3.76MPa, the second exhaust threshold value Pd2 settings
It is set as 4.05MPa for 3.9MPa, the third exhaust threshold value Pd3.
When the real-time ventilation pressure meets the condition of Pd≤Pd1, the variable-frequency multi-connection type air-conditioning system enter it is described just
Normal control model is simultaneously run, and under the normal control mode, the variable-frequency multi-connection type air-conditioning system carries out just according to ambient temperature
Normal converting operation.
When the real-time ventilation pressure meets the condition of Pd1 < Pd≤Pd2, the variable-frequency multi-connection type air-conditioning system enters institute
It states limitation control model and runs.
When the real-time ventilation pressure just reaches the condition of sufficient Pd1 < Pd≤Pd2, i.e., the described variable-frequency multi-connection type air-conditioning system is rigid
When into the limitation control model, be set, within the stand-by period, 16 aperture of the indoor expansion valve is kept the stand-by period
Current aperture state, the compressor 1 keep current operation frequency.The stand-by period is traditionally arranged to be 20 minutes.
When the compressor real-time frequency is less than maximum target frequency, the maximum target frequency is traditionally arranged to be described
The specified maximum frequency of compressor 1；The exhaust sensor 2 detects the real-time ventilation pressure still after the stand-by period
It is maintained within the scope of Pd1 < Pd≤Pd2, then the main control unit output frequency adjustment signal and aperture adjust signal, described
Expansion valve detection control module is controlled 16 aperture of indoor expansion valve and is gradually increased with first rate, while the frequency detecting
Control module controls the compressor frequency and slowly rises, until the compressor real-time frequency reaches maximum value；Preferably, institute
It states the first rate of 16 aperture of indoor expansion valve to walk for every 10 minutes 2-5, the compressor frequency is with every 10 minutes 1HZ's
Rate gradually increases.
Under the limitation control model, when the compressor real-time frequency has reached the maximum target frequency, and it is described
When the real-time evaporating temperature that inner disc sensor 18 detects is not up to optimum target evaporating temperature, the exhaust sensor 2 exists
Detect that the real-time ventilation pressure remains within the scope of Pd1 < Pd≤Pd2 after the stand-by period, then the master control list
Member output aperture adjusts signal, and the expansion valve detection control module controls the indoor expansion valve 16 and slowly automatically adjusted
Until the real-time evaporating temperature reaches the optimum target evaporating temperature.In general, 16 aperture of the indoor expansion valve is with every
The rate of 10 minutes 2-5 steps gradually changes adjusting, and the optimum target evaporating temperature is set as 7 DEG C.
Under the control of the limitation control model, the real-time ventilation pressure Pd is reduced to the first exhaust threshold value
Pd1 and it is following when, the variable-frequency multi-connection type air-conditioning system is restored to the normal control mode.
When the real-time ventilation pressure meets the condition of Pd2 < Pd≤Pd3, the variable-frequency multi-connection type air-conditioning system enters
The protection control model is simultaneously run.Specifically, under the protection control model state, the main control unit is forbidden promoting institute
Compressor frequency is stated, 16 aperture of the indoor expansion valve is opened greatly with the second rate enforcement, until the real-time ventilation pressure Pd drops
Down to the second exhaust threshold value Pd2 or less.If open the indoor expansion valve 16 with second rate and continue one section
Between after, the delivery temperature fall be less than 1 DEG C, then 16 aperture of the indoor expansion valve is with third speed positive opening, directly
It is reduced to the first exhaust threshold value Pd2 or less to the real-time ventilation pressure Pd.The interior is opened with second rate
The duration of expansion valve 16 is traditionally arranged to be 10 minutes.
In general, second rate is more than the first rate, the third speed is more than second rate；Preferably
, second rate is set as every three minutes 10 steps, and the third speed is set as every three minutes 20 steps.
When the real-time ventilation pressure meets the condition of Pd > Pd3, the variable-frequency multi-connection type air-conditioning system enters described strong
Control model processed is simultaneously run.
Under the pressure control model, the main control unit forces to reduce the compressor frequency, while by the room
16 aperture of interior expansion valve is opened greatly with fourth rate pressure, until the real-time ventilation pressure Pd is reduced to the second exhaust threshold value
Pd2 or less.If with the fourth rate opening indoor expansion valve 16 and after continuing for some time, the delivery temperature declines
Amplitude is less than 1 DEG C, then 16 aperture of the indoor expansion valve is opened greatly with the 5th rate enforcement, until the real-time ventilation pressure Pd drops
Down to the second exhaust threshold value Pd2 or less.The duration that the indoor expansion valve 16 is opened with the fourth rate is general
It is set as 5 minutes.
In general, the fourth rate is more than the third speed, the 5th rate is more than the fourth rate；Preferably
, the fourth rate is set as 60 step per minute, and the 5th rate is set as 100 step per minute.
When the real-time ventilation pressure Pd is reduced to the second exhaust threshold value Pd2 or less, the variable-frequency multi-connection type is empty
Adjusting system enters the limitation control model and runs, and under the control of the main control unit, in the limitation control model
Under further decrease the real-time ventilation pressure Pd, make the variable-frequency multi-connection type air-conditioning system enter the normal control mould
Formula.
The present embodiment delimit different system protection adjustment interval ranges, and each area according to the real-time ventilation pressure
Between can be modified according to load variations situation, while ensureing the variable-frequency multi-connection type air-conditioning system reliability service, root
16 aperture of the indoor expansion valve is adjusted in the comparison in different sections according to the real-time ventilation pressure, controls the compressor fortune
Line frequency avoids the real time exhaust gas temperature from being in the condition of high temperature, it is ensured that the variable-frequency multi-connection type air-conditioning system is in any environment
Best refrigeration effect down, to improve the comfort that user uses.
The foregoing is merely presently preferred embodiments of the present invention, is merely illustrative for the purpose of the present invention, and not restrictive
's.Those skilled in the art understand that in the spirit and scope defined by the claims in the present invention many changes can be carried out to it,
It changes or even equivalent, but falls in protection scope of the present invention.
Claims (10)
1. a kind of variable-frequency multi-connection type air-conditioning system protects control method, which is characterized in that including step：
S1, exhaust sensor (2), inner disc sensor (18) and the frequency detecting control module of variable-frequency multi-connection type air-conditioning system are collected
Real time data when operation of air conditioner；
S2, main control unit control the variable-frequency multi-connection type air-conditioning system according to the real time data and enter normal control mode, limit
Control model, protection control model or pressure control model processed；
The exhaust sensor (2) is arranged at the vent position of compressor (1)；The inner disc sensor (18) is arranged in institute
It states on evaporator (20)；
The inner disc sensor (18) obtains real-time evaporating temperature, and the frequency detecting control module obtains the real-time frequency of compressor
Rate, the exhaust sensor (2) obtain real-time ventilation information；The main control unit is to the real-time evaporating temperature, the compression
Machine real-time frequency and real-time ventilation information analysis processing, and corresponding output frequency adjustment signal and aperture adjust signal, institute
It states frequency detecting control module and the adjustment compressor frequency, expansion valve detection control mould is corresponded to according to the frequency adjusted signal
Root tuber corresponds to according to aperture adjustment signal and adjusts the expansion valve opening.
2. variable-frequency multi-connection type air-conditioning system as described in claim 1 protects control method, which is characterized in that the main control unit
It sets first exhaust threshold value, second exhaust threshold value, third and is vented threshold value, the first exhaust threshold value is less than the second exhaust threshold
Value, the second exhaust threshold value are less than the third and are vented threshold value；Pass through the first exhaust threshold value, the second exhaust threshold
Value, the third are vented threshold value to delimit different adjustment interval ranges, to judge that the variable-frequency multi-connection type air-conditioning system enters just
Normal control model, limitation control model, protection control model force control model.
3. variable-frequency multi-connection type air-conditioning system as claimed in claim 2 protects control method, which is characterized in that the exhaust sensing
When device (2) is set as temperature sensor, the exhaust sensor (2) obtains real time exhaust gas temperature Td；The first exhaust threshold value
Td1, the second exhaust threshold value Td2, third exhaust threshold value Td3 are set as temperature value.
4. variable-frequency multi-connection type air-conditioning system as claimed in claim 3 protects control method, which is characterized in that the real-time ventilation
When temperature meets the condition of Td≤Td1, the variable-frequency multi-connection type air-conditioning system enters the normal control mode, the normal control
Under molding formula, the variable-frequency multi-connection type air-conditioning system carries out frequency conversion normal operation according to ambient temperature.
5. variable-frequency multi-connection type air-conditioning system as claimed in claim 3 protects control method, which is characterized in that the real-time ventilation
When temperature meets the condition of Td1 < Td≤Td2, the variable-frequency multi-connection type air-conditioning system enters the limitation control model；Institute
The limitation control model setting stand-by period is stated, within the stand-by period, the indoor expansion valve (16) keeps current aperture shape
State, the compressor (1) keep current operation frequency；
When the compressor real-time frequency is less than maximum target frequency, the exhaust sensor (2) is after the stand-by period
Detect that the real time exhaust gas temperature is maintained within the scope of Td1 < Td≤Td2, then the main control unit output frequency adjustment letter
Number and aperture adjust signal, expansion valve detection control module control indoor expansion valve (16) aperture with first rate by
It is cumulative to add, while the frequency detecting control module controls the compressor frequency and rises, until the compressor real-time frequency
Reach maximum value.
6. variable-frequency multi-connection type air-conditioning system as claimed in claim 5 protects control method, which is characterized in that when the compressor
Real-time frequency reaches maximum target frequency, and the real-time evaporating temperature of the inner disc sensor (18) detection is not up to best
When target evaporating temperature, the exhaust sensor (2) detects that the real time exhaust gas temperature is maintained at after the stand-by period
Within the scope of Td1 < Td≤Td2, then the main control unit output aperture adjusts signal, and the expansion valve detects control module control
The indoor expansion valve (16) is made to automatically adjust until the real-time evaporating temperature reaches the optimum target evaporating temperature.
7. variable-frequency multi-connection type air-conditioning system as claimed in claim 3 protects control method, which is characterized in that the real-time ventilation
When temperature meets the condition of Td2 < Td≤Td3, the variable-frequency multi-connection type air-conditioning system enters the protection control model；Institute
It states under protection control model state, the main control unit is forbidden promoting compressor frequency, and the indoor expansion valve aperture is with second
Rate is opened greatly, until the real time exhaust gas temperature Td is reduced to the second exhaust threshold value Td2 or less；It is opened with second rate
During the big indoor expansion valve aperture, the delivery temperature fall is less than 1 DEG C, then the indoor expansion valve aperture
With third speed positive opening, until the real time exhaust gas temperature Td is reduced to the first exhaust threshold value Td2 or less.
8. variable-frequency multi-connection type air-conditioning system as claimed in claim 3 protects control method, which is characterized in that the real-time ventilation
When temperature meets the condition of Td > Td3, the variable-frequency multi-connection type air-conditioning system enters the pressure control model；In the pressure
Under control model, the main control unit is forced to reduce the compressor frequency, while by the indoor expansion valve aperture with the 4th
Rate is opened greatly, until the real time exhaust gas temperature Td is reduced to the second exhaust threshold value Td2 or less；With the fourth rate
During opening the big indoor expansion valve aperture, the delivery temperature fall is less than 1 DEG C, then the indoor expansion valve is opened
Degree is opened greatly with the 5th rate, until the real time exhaust gas temperature Td is reduced to the second exhaust threshold value Td2 or less.
9. variable-frequency multi-connection type air-conditioning system as claimed in claim 3 protects control method, which is characterized in that the first exhaust
Threshold value Td1 is set as 95 DEG C, and the second exhaust threshold value Td2 is set as 98 DEG C, and the third exhaust threshold value Td3 is set as 102
℃。
10. variable-frequency multi-connection type air-conditioning system as claimed in claim 2 protects control method, which is characterized in that the exhaust passes
When sensor (2) is set as pressure sensor, the exhaust sensor (2) obtains real-time ventilation pressure Pd；The first exhaust threshold
Value Pd1, the second exhaust threshold value Pd2, third exhaust threshold value Pd3 are set as pressure value, the first exhaust threshold value Pd2
It is set as 3.76MPa, the second exhaust threshold value Pd2 is set as 3.9MPa, and the third exhaust threshold value Pd3 is set as
4.05MPa。
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| CN201810524082.8A CN108709295B (en) | 2018-05-28 | 2018-05-28 | Protection control method for variable-frequency multi-connected air conditioning system |
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